City report · Yunnan, China
Gejiu Air quality today
Air quality in Gejiu currently reads AQI 77 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 77
Moderate
- PM2.5, fine particles (µg/m³)
- 23.0
- tree cover
- 42.0%
- trees in this area
- 125K
- more trees needed
- 0
Measured across a 2 km radius around Gejiu, Honghe Hani and Yi Autonomous Prefecture, Yunnan, China (12.57 km²), from a satellite image of Aug 13, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Gejiu · AQI 77 (Moderate)
Gejiu's tree count comes to 124,822 trees across 11.89 km² of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Gejiu today: AQI 77, Moderate
Main pollutant: PM2.5 · Observed Nov 11, 22:00 local time via World Air Quality Index Project ground stations, US EPA index. Values in µg/m³.
Ground station · 州图书馆, Honghe (红河州州图书馆), 22.7 km away
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
23.0
PM10
42.1
NO₂
—
O₃
—
SO₂
—
CO
—
Data: World Air Quality Index Project
- Outdoor exercise
- Fine for most people; unusually sensitive people should take long or hard exercise easier
- Windows
- Fine to open; close them if you are sensitive to pollution
- Mask
- Not needed for most people
- Air purifier
- Worth running if you are sensitive
Over the last 7 days, the CAMS air-quality model put Gejiu's daily AQI at 30 on average, from 13 on Nov 10 to an hourly peak of 75 on Nov 5.
Where Gejiu stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Gejiu: Healthy tree cover
42.0% tree cover against a 30% healthy-neighborhood target, across 11.89 km² of land.
Trees in this area
124,822
Target trees
124,822
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Gejiu lost?
Since 2001, the area within 10 km of Gejiu has lost about 535 hectares of forest (about 750 football pitches): 6.2% of the forest it had in 2000. Most of it (61%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations.
2018: satellite photo from February 2018 of a 5 × 5 km area about 7 km north of the city center.
- Forest lost since 2001
- 535 haabout 750 football pitches
- Share of its forest
- 6.2%of what there was in 2000
- Cleared for good
- 328 hadeforestation: turned into farms, mines or towns
The worst year was 2016, when about 54 hectares of forest were lost.
Hectares of forest lost each year
Show the figures as a table
| Year | Cleared for good | Can grow back | Total |
|---|---|---|---|
| 2001 | 3 ha | 1 ha | 4 ha |
| 2002 | 21 ha | under 1 ha | 21 ha |
| 2003 | under 1 ha | 2 ha | 2 ha |
| 2004 | 2 ha | under 1 ha | 2 ha |
| 2005 | 4 ha | 4 ha | 8 ha |
| 2006 | 9 ha | 5 ha | 14 ha |
| 2007 | under 1 ha | 1 ha | 2 ha |
| 2008 | 19 ha | 2 ha | 21 ha |
| 2009 | 20 ha | 8 ha | 29 ha |
| 2010 | 11 ha | under 1 ha | 11 ha |
| 2011 | 18 ha | 3 ha | 20 ha |
| 2012 | 36 ha | 6 ha | 42 ha |
| 2013 | 12 ha | 2 ha | 15 ha |
| 2014 | 17 ha | 15 ha | 32 ha |
| 2015 | 13 ha | 24 ha | 37 ha |
| 2016 | 32 ha | 22 ha | 54 ha |
| 2017 | 16 ha | 6 ha | 22 ha |
| 2018 | 15 ha | 4 ha | 19 ha |
| 2019 | 22 ha | 6 ha | 28 ha |
| 2020 | 9 ha | 6 ha | 15 ha |
| 2021 | 6 ha | 7 ha | 14 ha |
| 2022 | 15 ha | 10 ha | 25 ha |
| 2023 | 10 ha | 28 ha | 38 ha |
| 2024 | 11 ha | 25 ha | 36 ha |
| 2025 | 6 ha | 19 ha | 25 ha |
What is causing deforestation around Gejiu?
- Farms, pasture and plantationscleared for good52% · 277 ha
- Loggingcan grow back35% · 190 ha
- Mining and energycleared for good5.2% · 28 ha
Also: towns and roads, shifting farming, storms, floods and other natural causes, wildfires, unknown causes.
Causes for 2025 are estimates, based on what caused forest loss in the same places up to 2024.
Forest gained and lost, 2000–2020
- Forest in 2000
- 15,600 ha
- Forest in 2020
- 16,500 ha
- Overall change
- +933 hamore forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Gejiu grew from about 15,600 hectares to 16,500 hectares, a net gain of about 933 hectares (+6%). New forest grew on about 1,360 hectares, while 429 hectares were lost.
These 2000 and 2020 maps, from the University of Maryland, count any land with trees taller than 5 m as forest, including plantations and orchards. Forest that was cut or burned and had grown back by 2020 counts in both years, so the loss here is smaller than the yearly figures.
These figures cover everything within 10 km of the city center, a wider area than the report above, because forest is usually lost at a city's edges.
Source: Hansen/UMD/Google/USGS/NASA, Global Forest Change (GFC-2025-v1.13); causes: WRI/Google DeepMind drivers of forest loss; both CC BY 4.0, summed by Airleaf for each area. Forest gained and lost 2000–2020: Potapov et al. 2022, UMD GLAD Global Land Cover and Land Use Change, CC BY 4.0. Images: contains modified Copernicus Sentinel data. How it's measured
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Frequently asked
Questions about Gejiu
What is the air quality (AQI) in Gejiu right now?
The latest reading for Gejiu shows an AQI of 77 (Moderate), measured Nov 11, 22:00 local time by the 州图书馆, Honghe (红河州州图书馆) ground monitoring station, 22.7 km away, via OpenAQ. The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Gejiu today?
At AQI 77 (Moderate): fine for most people; unusually sensitive people should take long or hard exercise easier. Windows: fine to open; close them if you are sensitive to pollution. Masks: not needed for most people. The reading changes through the day, so check again before a long run or ride.
What has the air quality in Gejiu been like this week?
Over the last 7 days, the CAMS air-quality model put Gejiu's daily AQI at 30 on average, from 13 on Nov 10 to an hourly peak of 75 on Nov 5. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Gejiu lost since 2001?
Since 2001, the area within 10 km of Gejiu has lost about 535 hectares of forest (about 750 football pitches): 6.2% of the forest it had in 2000. Most of it (61%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations. Comparing satellite maps from 2000 and 2020, the forest around Gejiu grew from about 15,600 hectares to 16,500 hectares, a net gain of about 933 hectares (+6%). New forest grew on about 1,360 hectares, while 429 hectares were lost.
What is the tree count in Gejiu?
Gejiu has an estimated 124,822 trees across the 11.89 km² of land measured — 42.0% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Gejiu need?
Gejiu has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Gejiu's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Gejiu, via OpenAQ; the 7-day trend is the Open-Meteo / CAMS model's estimate. Tree cover is measured from Sentinel-2 L2A (ESA Copernicus) via Earth Search satellite imagery at 10 m detail across a 2 km radius around Gejiu; the tree count is an estimate derived from that cover.
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